Hook



FIG. 1 is a front view of a hook showing my new design;

FIG. 2 is a perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a right side view thereof; the left side view being a mirror image.

The back view forms no part of the claimed design. The broken lines shown in FIGS. 1-5 represent environmental subject matter and form no part of the claimed design. 

The ornamental design for a hook, as shown and described. 